A directional poppet valve (10) has valve pistons (16-22) arranged in a valve housing (12) for controlling a plurality of fluid connections (A, B, P, T). The positions of each valve pistons (16-22) in the valve housing (12) can be changed by at least one actuating device. The fluid connections (A, B, P, T) are connected to one another or separated from one another alternately depending on the position of the valve pistons (16-22). The valve pistons (16-22) are arranged inline along at least one axis (R), consecutively and/or at least such as to partially interengage, in the valve housing (12).

A multiway control valve is provided having a housing that has an inlet connection and an outlet connection for a liquid and/or gaseous medium, a rotatably mounted ceramic valve disc, which is arranged with a first through-flow opening and rotatably mounted in the housing to fluidically connect and disconnect from each other the connections depending on its rotational position. The valve disc rests flatly on a ceramic sealing disc, arranged in a torque-proof manner and having two second through-flow openings, and a sealing element, which is arranged between the sealing disc and an intermediate floor of the housing and is elastically deformable. The sealing element has a disc shape and has third through-flow openings that are aligned with the second through-flow openings. The intermediate floor has at least one retaining projection that engages in one of the three through-flow openings for positively locking anti-twist protection of the sealing element.

The invention relates to a micro pilot valve 1, which is characterized by a micro cavity 2, which is connected with valve outlet 3, a first micro opening 4 between micro cavity 2 and a first pressure level 5, a second micro opening 6 between micro cavity 2 and a second pressure level 7, a sealing element 8 within micro cavity 2, which is movable between the micro openings, and which in a first end position closes micro opening 4 and in a second end position micro opening 6, whereas the control pressure in the first end position adopts the value of the second pressure level 7 and in the second end position the value of the first pressure level 5, and a micro actuator 10, which actuates sealing element 8 via a transfer element, which protrudes at least through one of the micro openings.

A gate valve is comprised of a gate movable between open and closed positions within a valve body, and gate having defined through it the gate an equalizer port or passageway between opposite sides of the gate with fixed side walls. The equalizer passageway being is opened and closed by an internal gate. The internal gate is in a close fitting engagement with each of a pair of opposing valve seats mounted with the gate and is shiftable by a carrier that does not constrain movement of the internal gate as it sits between the valve seats.

A hydraulic valve, in particular for a cam phaser of a cam shaft, the hydraulic valve including a supply connection with a check valve for supplying a hydraulic fluid; at least one first operating connection and a second operating connection; at least one first tank outlet and a second tank outlet for draining the hydraulic fluid; a piston that is moveable in a bore hole along a longitudinal direction of the bore hole for distributing the hydraulic fluid from the supply connection to the first operating connection and/or the second operating connection and for conducting the hydraulic fluid from the first operating connection to the second operating connection and from the first operating connection to the first tank outlet and/or from the second operating connection to the second tank outlet; and a sleeve that is arranged in the piston moveable relative to the piston in the longitudinal direction.

A swivel joint including a pivot provided with a longitudinal axis; and a seating concentric to the pivot and in which the pivot is sealedly rotatable. The pivot includes an inlet conduit, a signal conduit, and a discharge conduit. The swivel joint further includes a connecting device, structured so as to assume a first configuration, in which it closes the inlet conduit and places the signal conduit in communication with the discharge conduit, and a second configuration, in which it places the inlet conduit in communication with the signal conduit and closes the discharge conduit. The connecting device is further structured so as to move between the first configuration and the second configuration following the rotation of the pivot with respect to the seating over a predetermined angle starting from an initial position.

A flow reversing device for performing blood treatment can include a flow reversing actuator. The flow reversing actuator can receive and engage a disposable tubing set with multiple branches that form forward and reverse blood flow paths respectively when blood the flow reversing actuator is selectively changed between forward and reverse configurations. The shape of the tubing can be such that during forward operation, dead regions of non-flowing blood are defined. The flow reversing actuator can have a controller configured to operate generally in forward mode. At first times, the controller can cause the flow reversing actuator to clear the dead regions. At second times, the controller can cause the flow reversing actuator to test for leaks by reversing the flow of blood for a period of time sufficient to cause air to be drawn into the tubing set and conveyed to an air sensor.